CODEWITHSUNDEEP
c#itext
Svetlozar Angelov
Svetlozar Angelov

Reputation: 21660

Sign PDF with one signature, but with several signature appearances

I want to sign a pdf with one signature with appearance on every page

Here is what I do:

Create the stamper

 PdfStamper st = PdfStamper.CreateSignature(reader, new FileStream(this.outputPDF, FileMode.Create, FileAccess.Write), '\0', null, true);

Get the signature appearance

PdfSignatureAppearance sap = st.SignatureAppearance;

populate the properties 

 sap.SetCrypto(...);
 sap.Reason = SomeString;
 sap.Contact = SomeString;
 sap.Location = SomeString;

Each stamper has one appearance. I am able to set only signature appearance. Has anyone done something like that? Do I have to create a List of Stampers or a List of SignatureAppearances?

Upvotes: 3

Views: 1119

Answers (2)

Lonzak
Lonzak

Reputation: 9816

Actually this is possible but not recommended and forbidden starting with PDF 2.0. But there are examples in the wild describing it in more detail: Here, here and here.

Upvotes: 0

Pent Ploompuu
Pent Ploompuu

Reputation: 5414

A single PdfSignatureAppearance is always associated with a single page and it's not possible to add more than one annotation to a signature object.

Upvotes: 2

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